Missouri - Area of significance: Architecture
| Old California City Hall and Fire Station |
| Old City Hall |
| Old Ferguson West Historic District |
| Old Gerald School |
| Old Laclede Gas and Light Company Building |
| Old Neighborhoods Historic District |
| Old New England Building |
| Old Rock House |
| Old Stone Church |
| Old Stone Hill Historic District |
| Old St. Patrick's Church |
| Old Town Historic District |
| Old Webster Historic District |
| Old Webster Historic District |
| Olean Railroad Depot |
| Olive Chapel African Methodist Episcopal Church |
| Oliver-Leming House |
| Olivia Apartments |
| Olympia, The |
| One Bell Center |
| Opera Hall Block |
| Orchard Acres |
| Osage Farms Type 315:13 Government Farmhouse |
| Osage Farms Unit No. 1 Historic District |
| Osage Farms Unit No. 25 Historic District |
| Osage Farms Unit No. 26 Historic District |
| Osage Farms Unit No. 30 Historic District |
| Osage Farms Unit No. 31 |
| Osage Farms Unit No. 41 |
| Osage Farms Unit No. 43 Historic District |
| Osage Farms Units No. 5 and No. 6 Historic District |
| Osage Farms Units No. 8 and No. 9 Historic District |
| Osage Hills School |
| Osceola Public School Building |
| Ostertag, Robert, House |
| Otzenberger House |
| Our Lady of Perpetual Help Parish Hall, School, Convent, and Rectory |
| Overfelt-Campbell-Johnston House |
| Owens, Given, House |
| Owens-McCoy House |
| Ozark Courthouse Square Historic District |
| Page Boulevard Police Station |
| Palace Clothing Company Building |
| Palace Hotel |
| Panhorst Feed Store |
| Pappas, Theodore, A., House |
| Parade Park Maintenance Building |
| Paris and Weaver Apartment Buildings |
| Paris Male Academy |
| "Parker, Lester S. and Missouri ""Zue"" Gordon, House" |
| Park, George M., House |
| Park Lane Apartments |
| Park Manor Historic District |
| Parkview Historic District |
| Parkview, The |
| Parnell, Samuel T. and Mary B., House |
| Parrish, D.L., Laundry Company Building |
| Pasadena Hills Historic District |
| Patee Town Historic District |
| Patterson, Elisha and Lucy, Farmstead Historic District |
| Payne-Gentry House |
| Peabody Coal Company National Headquarters |
| Pearl Apartments and Windsor Apartments |
| Peck, George B., Dry Goods Company Building |
| Peery, Samuel and Pauline, House |
| Pelster, Wilhelm, House-Barn |
| Pennbroke Apartments |
| Peppard, Joseph Grear, House |
| Perfection Stove Company Building |
| Perry County Courthouse |
| Peters, Charles and Josephine, House |
| Peters House |
| Peters, Louis H., House |
| Peters, Nelle E., Troost Avenue Historic District |
| Peters Shoe Company Building |
| Pet Plaza |
| Pevely Dairy Company Buildings |
| Phelps Country Estate |
| Phillips, Homer G., Hospital |
| Phillips, John Archibald, House |
| Phipps-Wallace Store Building |
| Pickwick Hotel, Office Building, Parking Garage and Bus Terminal |
| Pierce City Fire Station, Courthouse and Jail |
| Pierce Pennant Motor Hotel |
| Pigott, Josephine Trigg, House |
| Pike County Hospital |
| Pilgrim Lutheran Church for the Deaf of Greater Kansas City and Parsonage |
| Pine Lawn Carriage House |
| Piney Beach |
| Pink House |
| Pitcher Store |
| Plant, Samuel, House |
| Platte County Courthouse |
| Plaza Hotel |
| Plaza Hotel Complex |
| Plaza House Apartments |
| Plaza Square Apartments Historic District |
| Plaza Towers |
| Pleasant Green |
| Pleasant Hill Downtown Historic District |
Data from United States Park Service and Wikidata
